Pneumatic brake for motor-vehicles.



E. E. SWEET. v PNEUMATIC BRAKE FOR MOTOR VEHICLES.

APPLIOATION IILED JAN. 11, 1908.

x um" 5: R m- W20 nes (4Z7; weef Patented June 1909.

UNITE PATENT orrion.

ERNEST SWEET, or DETROIT, MICHIGAN, Asslenon ToeAn'ILLAo Moron OAR COMPANY,

- or DETROIT, MICHIGAN, A CORPORATION or MICHIGAN.

PNEUMATIC BRAKE 'FOR vro'roR vEHIoLEs'.

Application filed January 11, 1908. Serial No. 410,440.

To all whom it may concern:

Be it known that I, ERNEST E. SWEET, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Pneumatic Brakes for Motor-Vehicles,'of which the following is a specification, reference being had to the accompanying drawings.

It. is the object of the invention to obtain a progressively"increasing pneumatic braking pfi'ect by using the explosion engine as a' dash pot and by so controlling it as to vary the resistance'wliich it produces.

To this end the invention consists in the peculiar construction of the valve-operating mealmnisnfiturther in the means for controllin this mechanism to produce the brakingmflect, and further in the combination thereof with the. actuating mechanism for the mechanical brake, as more fully hereinafter set forth.

In the drawings; Figure l is an elevation of the valve controlling mechanism as applied to the engine, illustrating diagrammatically its connection with the brake actuating mechanism; Figs. 2, 3, 4, and 5 are sections respectively on lines Z-Z, -Y--Y, XX, WVV, Fig. 6; and Fig. 6 is an elevation of the shiftable exhaust cam.

A is the camshaft of an explosion engine, and upon which are mounted both the inlet valve controlling cam B and the exhaust valve cam C.

The cam ll is of suitable configuration to eflect the inoven'ient of its cooperating valve rod 1) so as to produce the desired tuning ellect in the normal operation of the engine, and the cam C is provided with a portion E for properly timing the operation of the exhaust valve. The shaft A is mounted to be longitudinally adjustable and is connected with a suitable shifting mechanism, such as the link 1*, engaging a collar (i upon the shaft, and connected with a foot lever ll.

The cam C in addition to the portion E thereof, which controls the normal operation of the exhaust valve, is further provided with a plurality of adjacent portions I, J and K. The portion 1 is arranged to reglster with the valve rod 1) when the shaft A is adjusted longitudinally a sufiicient distance to disengage the cam B from the rod 1), and the cam I is so tashioned as to open Specification of Letters Patent. I

Patented June 22, 1909.

open the exhaust valve during a portion of 1 the suction stroke, and to maintainit closed for practically all ofthe-compression stroke, while the next'adjacent cam K is arranged to openthe exhaust valve .for a portion of every. down-stroke of the-engine (the explosion stroke as well as the suction stroke) and maintain it closed through practically all of each upward stroke gthe compres- -sion and scavenging strokes o the engine). lVith the cam construction just described, it will be understood that by movement of the pedal lever H the inlet valve operating mechanism will first be thrown out of operation, permitting said valve to remain seated, andthus cutting on the fuel supply. At the same'time,..an adjustment of the pedal, which brings the cam I in operative posit-ionfwill cause the engine piston and cylinder to operate as a dash-pot, but this operation, is confined to a portion only of what would correspond to the suction and compression strokes of the engine when in normal operation. A further adjustment of the pedal lever bringing the cam J in operative position will cause the engine piston and cylinder to operate as a dash pot during the entire or practically the entire suction and compression strokes, but not during the strokes corresponding -to the exploding and scavenging strokes of the engine when in operation. Finally an adjustment of the pedal, which brings the cam K into operative position, will cause the engine to operate as a dash pot practically all the time. Thus a progressively increasing resistance to the movement of the mechanism is effected by merely pressing upon the pedal 11.

- What I claim as my invention is:

l. The combination in an explosion ongi11e,;co1nprising an explosion cylinder and inlet and exhaust valves therefor, of means for normally actuating said exhaust valve, and an auxiliary mechanism for operating the exhaust valve for converting the cylinder into a dash pot.

2. The combination in an explosion en-- ajed auxiliary mechanism for actuating said exhaust valve to cause said cylinder to operate as a retarderof variable resistance.

3, The combination in an explosion engine, comprising an exhaust valve, a. cani to actuate said valve while the engine is oper ating as a motor, and a secondcam adapted to actuate said exhaust valve -to causesaid engine to act as a retarder. f 4

4. The combination in an explosion engine, comprising an ex aust valve, a cam to actuate said valve whil the engine is operating as a motor, and a series of auxiliary cams adapted to in .turn actuate the exhaust valve to cause said engine to act as a re.

tarder of increasing resistance.

5. The combination 1n an explosion engine, of inlet and exhaust valves therefor,

,means for normally, actuating said valves,

and means for throwing out ofoperation the actuating .mechanismfor one of said valves and operating theiother .valve toconvert the engine into a dash pot.

6. The combination in an explosion ongine, of inlet and exhaust valves therefor, of means for normally actuating, said valves, and means for throwing out of operation the actuating lnechanism for the 'nlet valve and for. operating the exhaust mlve to convert the engine into a dash. pot, said means being adapted to effect various degrees of Iresistance.

4. The'combination in an explosion engene, of -1nlet and exhaust valves therefor,;a

cam shaft, cams thereon for normally actuating said valves, an auxiliary can on said shaftfor said exhaust valve, means for shifting said cam shaft to throw the cam for normally operating said valves out of operation and to place the auxiliary cam the degrees of resistance, comprising a plurality of graduated auxiliary camson said cam shaft for the'exhaust valve, and means for shifting said shaft to throw the cains, for

normally operating the valves, out of opera-.

tion and place. one of said auxiliary cams into operative relation to the exhaust valve. 9. The combination with an explosion ongine, of means controlling the valve-operated mechanism thereof for converting said engine into a dash pot, said means effecting various degrees of resistance to the move-.

mentof the motor, first, during a portion of alternate strokes. then through all of alter;

nate strokes, and'then through all of each stroke, for the purpose described.

In testimony whereof I affix my signature in presence of two Witnesses.

ERNEST n. SWEET.

Witnesses:

Amnnnr \ViLL AMs, NELLIE KiNseLLA. 

